using latest sourceforge cvs repository snapshot (from logger 'INFO: JGroups version: 2.8.0.CR6').

while this is not causing any noticicable failures in our testing I noticed that the
connected and closed flags are set in synchronized but read in unsynchronized methods - patch file attached.

note also attached in patch : made additional_data a concurrent hashmap:
protected final Map<String,Object> additional_data=new ConcurrentHashMap<String,Object>();

as I think concurrently executing send(Message msg) operations which call ' down(new Event(Event.MSG, msg));'
which in turn calls additional_data.putAll(m) will result in inconsistent hashmap state if putAll operations are concurrent
but as I am unfamiliar with the code I am not sure what is the best way to address this.